The next patch in this series introduces a call to cmpxchg64() in the block layer core for those architectures on which this functionality is available. Make it possible to test whether cmpxchg64() is available by introducing CONFIG_ARCH_HAVE_CMPXCHG64. Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Will Deacon <will.deacon@xxxxxxx> Cc: Tony Luck <tony.luck@xxxxxxxxx> Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx> Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> Cc: "James E.J. Bottomley" <jejb@xxxxxxxxxxxxxxxx> Cc: Helge Deller <deller@xxxxxx> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> Cc: Paul Mackerras <paulus@xxxxxxxxx> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx> Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx> Cc: David S. Miller <davem@xxxxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: H. Peter Anvin <hpa@xxxxxxxxx> Cc: Chris Zankel <chris@xxxxxxxxxx> Cc: Max Filippov <jcmvbkbc@xxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: Jonathan Corbet <corbet@xxxxxxx> --- .../features/locking/cmpxchg64/arch-support.txt | 33 ++++++++++++++++++++++ arch/Kconfig | 4 +++ arch/arm/Kconfig | 1 + arch/ia64/Kconfig | 1 + arch/m68k/Kconfig | 1 + arch/mips/Kconfig | 1 + arch/parisc/Kconfig | 1 + arch/riscv/Kconfig | 1 + arch/sparc/Kconfig | 1 + arch/x86/Kconfig | 1 + arch/xtensa/Kconfig | 1 + 11 files changed, 46 insertions(+) create mode 100644 Documentation/features/locking/cmpxchg64/arch-support.txt diff --git a/Documentation/features/locking/cmpxchg64/arch-support.txt b/Documentation/features/locking/cmpxchg64/arch-support.txt new file mode 100644 index 000000000000..84bfef7242b2 --- /dev/null +++ b/Documentation/features/locking/cmpxchg64/arch-support.txt @@ -0,0 +1,33 @@ +# +# Feature name: cmpxchg64 +# Kconfig: ARCH_HAVE_CMPXCHG64 +# description: arch supports the cmpxchg64() API +# + ----------------------- + | arch |status| + ----------------------- + | alpha: | ok | + | arc: | .. | + | arm: | ok | + | arm64: | ok | + | c6x: | .. | + | h8300: | .. | + | hexagon: | .. | + | ia64: | ok | + | m68k: | ok | + | microblaze: | .. | + | mips: | ok | + | nds32: | .. | + | nios2: | .. | + | openrisc: | .. | + | parisc: | ok | + | powerpc: | ok | + | riscv: | ok | + | s390: | ok | + | sh: | .. | + | sparc: | ok | + | um: | .. | + | unicore32: | .. | + | x86: | ok | + | xtensa: | ok | + ----------------------- diff --git a/arch/Kconfig b/arch/Kconfig index 8e0d665c8d53..9840b2577af1 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -358,6 +358,10 @@ config HAVE_ALIGNED_STRUCT_PAGE on a struct page for better performance. However selecting this might increase the size of a struct page by a word. +config ARCH_HAVE_CMPXCHG64 + bool + default y if 64BIT + config HAVE_CMPXCHG_LOCAL bool diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index a7f8e7f4b88f..02c75697176e 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -13,6 +13,7 @@ config ARM select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL select ARCH_HAS_STRICT_MODULE_RWX if MMU select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST + select ARCH_HAVE_CMPXCHG64 if !THUMB2_KERNEL select ARCH_HAVE_CUSTOM_GPIO_H select ARCH_HAS_GCOV_PROFILE_ALL select ARCH_MIGHT_HAVE_PC_PARPORT diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig index bbe12a038d21..31c49e1482e2 100644 --- a/arch/ia64/Kconfig +++ b/arch/ia64/Kconfig @@ -41,6 +41,7 @@ config IA64 select GENERIC_PENDING_IRQ if SMP select GENERIC_IRQ_SHOW select GENERIC_IRQ_LEGACY + select ARCH_HAVE_CMPXCHG64 select ARCH_HAVE_NMI_SAFE_CMPXCHG select GENERIC_IOMAP select GENERIC_SMP_IDLE_THREAD diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig index 785612b576f7..7b87cda3bbed 100644 --- a/arch/m68k/Kconfig +++ b/arch/m68k/Kconfig @@ -11,6 +11,7 @@ config M68K select GENERIC_ATOMIC64 select HAVE_UID16 select VIRT_TO_BUS + select ARCH_HAVE_CMPXCHG64 select ARCH_HAVE_NMI_SAFE_CMPXCHG if RMW_INSNS select GENERIC_CPU_DEVICES select GENERIC_IOMAP diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 225c95da23ce..088bca0fd9f2 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -7,6 +7,7 @@ config MIPS select ARCH_DISCARD_MEMBLOCK select ARCH_HAS_ELF_RANDOMIZE select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST + select ARCH_HAVE_CMPXCHG64 if 64BIT select ARCH_SUPPORTS_UPROBES select ARCH_USE_BUILTIN_BSWAP select ARCH_USE_CMPXCHG_LOCKREF if 64BIT diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig index fc5a574c3482..166c30865255 100644 --- a/arch/parisc/Kconfig +++ b/arch/parisc/Kconfig @@ -30,6 +30,7 @@ config PARISC select GENERIC_ATOMIC64 if !64BIT select GENERIC_IRQ_PROBE select GENERIC_PCI_IOMAP + select ARCH_HAVE_CMPXCHG64 select ARCH_HAVE_NMI_SAFE_CMPXCHG select GENERIC_SMP_IDLE_THREAD select GENERIC_CPU_DEVICES diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index cd4fd85fde84..4f886a055ff6 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -8,6 +8,7 @@ config RISCV select OF select OF_EARLY_FLATTREE select OF_IRQ + select ARCH_HAVE_CMPXCHG64 select ARCH_WANT_FRAME_POINTERS select CLONE_BACKWARDS select COMMON_CLK diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index 8767e45f1b2b..e3429b78c491 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -75,6 +75,7 @@ config SPARC64 select HAVE_PERF_EVENTS select PERF_USE_VMALLOC select IRQ_PREFLOW_FASTEOI + select ARCH_HAVE_CMPXCHG64 select ARCH_HAVE_NMI_SAFE_CMPXCHG select HAVE_C_RECORDMCOUNT select NO_BOOTMEM diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index c07f492b871a..52331f395bf4 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -67,6 +67,7 @@ config X86 select ARCH_HAS_SYNC_CORE_BEFORE_USERMODE select ARCH_HAS_UBSAN_SANITIZE_ALL select ARCH_HAS_ZONE_DEVICE if X86_64 + select ARCH_HAVE_CMPXCHG64 if X86_CMPXCHG64 select ARCH_HAVE_NMI_SAFE_CMPXCHG select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI select ARCH_MIGHT_HAVE_PC_PARPORT diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index c921e8bccdc8..0e5c77958fa3 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -4,6 +4,7 @@ config ZONE_DMA config XTENSA def_bool y + select ARCH_HAVE_CMPXCHG64 select ARCH_NO_COHERENT_DMA_MMAP if !MMU select ARCH_WANT_FRAME_POINTERS select ARCH_WANT_IPC_PARSE_VERSION -- 2.16.3
